A great comet is a comet that becomes exceptionally bright and easily observable to the naked eye. There is no official definition; the term is often attached to comets such as Halley's Comet, which, during certain appearances, are bright enough to be noticed by casual observers not looking for them and become well known outside the astronomical community.
A great comet is a comet that becomes exceptionally bright and easily observable to the naked eye. There is no official definition; the term is often attached to comets such as Halley's Comet, which, during certain appearances, are bright enough to be noticed by casual observers not looking for them and become well known outside the astronomical community.
Source: Wikipedia "Great comet" · CC BY-SA 4.0
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